World champion Lewis Hamilton set the fastest time and crashed his Mercedes on an eventful, rain-affected opening practice day at the Canadian Grand Prix in Montreal.
Hamilton had got his time down to 1 minute 15.988 seconds and was fastest again, but he aquaplaned off the track into the barriers.
Hamilton and teammate Nico Rosberg were the only drivers to break 1 minute 17 seconds around the track in the morning session, with Hamilton's best time of 1 minute 16.212 seconds more than four-tenths of a second quicker than Rosberg.